The Australian D40 (prior model to yours) has the same payload, but it's in kilos, so more than twice as much.
Curiously, the reputation there is that it has a good deal of known issues beyond the "weak diff" complaints we hear stateside. Not sure if that is from the increased payload, being built in Thailand, or just outback love, but I don't think the door sticker is the whole story.
I’ve kept everything as light as possible, using Rubbermaid bins instead of building drawers, the whole topper is aluminum and surprisingly light. Even still, I am likely flirting with the max payload when fully geared up. Truck still feels nimble, powerful and quick to stop. Happy with its performance on and off pavement